Make a simple brown butter sauce in the same pan you cook the trout.
Heat 6 tbsps butter in the skillet over medium heat until it turns a light brown. Add 2 tbsps. chopped sage, 1 tbsp. sherry or white wine vinegar, 1 tbsp. lemon juice. Whisk to emulsify being sure to scrape up any pieces of trout. Season to taste with salt and pepper and pour over fish.